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Thread: closing an open host on postfix

  1. #1
    Join Date
    Mar 2008
    Ubuntu 9.04 Jaunty Jackalope

    Question closing an open host on postfix

    I have read many tutorials and guides on how to apply authentication to SMTP on postfix and so far had no look making it work, I do have authentication on dovecot on the pop3 and IMAP servers
    I have been trying to make this work now for on and off 3 months now and am completely stumped
    I am running my own server with a dynamically IP address but I have a DNS service to give me a fixed domain name which works.
    as I am on a dynamic IP I can't send email to external accounts as they need to to through a relay host but I cant set that up until there is some form of authentication on the smtp of postfix even if its just plain-text

    originality I ran a windows server with hmailserver which was so easy to setup and use

    I have postfix, dovecot, sasld installed

    below are my postfix file and I can post my dovecot if needs be
    # See /usr/share/postfix/ for a commented, more complete version
    # Debian specific:  Specifying a file name will cause the first
    # line of that file to be used as the name.  The Debian default
    # is /etc/mailname.
    #myorigin = /etc/mailname
    smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
    biff = no
    # appending .domain is the MUA's job.
    append_dot_mydomain = no
    # Uncomment the next line to generate "delayed mail" warnings
    #delay_warning_time = 4h
    readme_directory = no
    # TLS parameters
    smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
    smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
    #smtpd_tls_cert_file = /etc/ssl/certs/server.crt
    #smtpd_tls_key_file = /etc/ssl/private/server.key
    smtpd_use_tls = yes
    smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
    # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
    # information on enabling SSL in the smtp client.
    #myhostname = ubuntu-server
    myhostname =
    alias_maps = hash:/etc/aliases
    myorigin = /etc/mailname
    mydestination =, ubuntu-server, localhost.localdomain, localhost,
    mailbox_size_limit = 0
    recipient_delimiter = +
    inet_protocols = all
    home_mailbox = Maildir/
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_type = dovecot
    smtpd_sasl_path = private/dovecot-auth
    smtpd_sasl_authenticated_header = yes
    smtpd_sasl_security_options = noanonymous
    smtpd_sasl_local_domain = $myhostname
    broken_sasl_auth_clients = yes
    smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_relay_domains
    smtpd_sender_restrictions = reject_unknown_sender_domain
    mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot-postfix.conf -n -m "${EXTENSION}"
    smtp_use_tls = yes
    smtpd_tls_received_header = yes
    smtpd_tls_mandatory_protocols = SSLv3, TLSv1
    smtpd_tls_mandatory_ciphers = medium, high
    smtpd_tls_auth_only = yes
    tls_random_source = dev:/dev/urandom
    smtp_tls_note_starttls_offer = yes
    smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
    smtpd_tls_loglevel = 1
    smtpd_tls_session_cache_timeout = 3600s

  2. #2
    Join Date
    Jun 2008
    North Carolina
    Ubuntu 9.10 Karmic Koala

    Re: closing an open host on postfix

    From a quick look I didn't see anything particularly wrong with your file. Comparing it to mine, which does use authentication on SMTP, the only difference I can see is in the SMTPD_RECIPIENT_RESTRICTIONS. In my file, I have the following entry "permit_sasl_authenticated".

  3. #3
    Join Date
    Mar 2008
    Ubuntu 9.04 Jaunty Jackalope

    Re: closing an open host on postfix

    if I telnet to port 25 I get the following:

    250-SIZE 10240000
    250 DSN

    I am have complete access to the server so can post any additional information you need it just say what you need me to find

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